3 Substrate Quality Substrate Preparation Application Conditions / Limitations Substrate Temperature Ambient Temperature Substrate Moisture Content Relative Air Humidity Fresh concrete: Surface must be free of bleed water and of sufficient strength to withstand finishing operations. Hardened / old concrete: Surfaces must be sound, open textured, clean, free from frost, laitance, surface water, oils, grease, coatings, all loosely adhering particles and other surface contaminants. If in doubt apply a test area first. For best results, concrete floors must be treated with Sikafloor -CureHard-24 at least 7-14 days after their placement or after the cement has had sufficient time to hydrate. Fresh concrete: The concrete must be prepared by suitable power or manual floating/tamping techniques. Hardened / old concrete: The substrate must be prepared by suitable mechanical preparation techniques such as high pressure water and allowed to dry or abrasive blast cleaning equipment. All dust, dirt, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush and / or vacuum. +5 C min, +35 C max. +5 C min, +35 C max. Can be applied on green concrete, without any bleed water. 100% max. Application Instructions Mixing Application Method / Tools Cleaning of Tools Product is supplied ready to use. Fresh Concrete as a curing membrane: Apply in a continuous film using a high volume low pressure spray unit as soon as the surface is firm enough to walk on and in sufficient quantity to keep the surface damp for at least 30 minutes. Hardened Concrete as a sealer : Apply in a continuous film using a high volume low pressure spray unit. Hardened Concrete as a high lustre dense finish To ensure maximum penetration, scrub material into the surface with a soft bristle broom or floor-scrubbing machine (min. 30 minutes), until material begins to gel and become slippery. Wet the material lightly with a water spray and rework it into the surface for another minutes. After this process, rinse the floor and remove any excess material using a squeegee, wet vacuum or mop. On porous, rough-textured or broom-finished surfaces, a second coat may be required. For large surfaces and greater placing rates, mechanical equipment such as ride-on cleaning machines can be also used to place, brush in and remove the excess material from the surface. Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be mechanically removed. Do not use sprayers that were used for spraying silicones or release agents (oils). 3 3/5

4 Waiting Time / Overcoating Where 2 coats are required to ensure maximum densification the second coat can be installed 2-4 hours following the first. Allow previous coats to become tack free before applying additional coats. Temperature +5 C Time ~ 4 hours +10 C +20 C ~ 3.5 hours ~ 3 hours Drying Time Notes on Application / Limitations +25 C ~ 2 hours Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity. The surface is touch-dry after 2 hours at +20 C. Maximum sealing and hardening effect achieved after 7 days at +20 C. In hot weather (above +25 C) store Sikafloor -CureHard-24 in a cool place prior to use. In low temperatures (below +10 C) the product may thicken and be difficult to spray. Do not use sprayers, which have been used to spray silicones or release agents. Do not mix differing formulations of Sika or other curing membranes. Ensure spraying equipment is cleaned thoroughly before use and residues of previous membranes are removed. Sikafloor -CureHard-24 must be treated mechanically (from light to heavy shot blasting depending on the depth of the penetration) prior to the application of a coating system. Sikafloor -CureHard-24 will increase abrasion resistance compared to untreated concrete of the same type. Immediately wash over-spray from glass, aluminium or highly polished surfaces with water to avoid etching of surfaces. Do not use on substrates treated previously with curing agents, membrane forming sealers or asphalt until these layers have been removed completely. Only use as curing compound for unregulated specification application. Gelification time may be increased at low temperatures (below +10 C), high humidity (from 80% to 100%) or wind free conditions. In hot weather conditions (above +25 C), gelification may occur before material has penetrated sufficiently. In such case, apply additional Sikafloor -CureHard-24 to keep the surface wet for the recommended 30 minutes. When applying, leave no dry spots in order to have homogenous performance. Touch up where necessary. For both old and new concrete, thoroughly wash and remove off residue or excess material. This is important as it is difficult to do so if allowed to dry and may result in unsightly white stains. This residue solution is non toxic and can be emptied into a sanitary sewer. Performance enhancement of the substrates will vary greatly depending on the age, cement content, humidity content, porosity and penetration of the product into the substrate. Sikafloor -CureHard-24 will not compensate for poor substrates with low cement content. It is not intended for substrates which are lightweight or extremely porous or have worn (aggregate exposed) surfaces. Sikafloor -CureHard-24 will not hide serious staining or excessive wear. 4 4/5

5 Construction Curing Details Applied Product ready for use Substrate temperature +10 C +20 C +30 C Fully serviceable ~ 6 hours ~ 5 hours ~ 4 hours Note: Times are approximate and will be affected by changing ambient and substrate conditions. Cleaning / Maintenance Methods Value Base To maintain the appearance of the floor after application, Sikafloor -CureHard-24 must have all spillages removed immediately and must be regularly cleaned using rotary brushes, mechanical scrubbers, scrubber dryers, high pressure washers, wash and vacuum techniques, etc., using suitable detergents and waxes. All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control. Local Restrictions Please note that as a result of specific local regulations the performance of this product may vary from country to country. Please consult the local Product Data Sheet for the exact description of the application fields. Health and Safety Information Legal Notes Note EU Regulation 2004/42 VOC - Decopaint Directive For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety-related data. The information, and, in particular, the recommendations relating to the application and end-use of Sika products, are given in good faith based on Sika's current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with Sika s recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product s suitability for the intended application and purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be supplied on request. The following chapter is only mandatory for European countries. According to the EU-Directive 2004/42, the maximum allowed content of VOC Product category IIA / h type wb) is 30 g/l (Limit 2010), for the ready to use product. The maximum content of Sikafloor -CureHard-24 is < 30 g/l VOC for the ready to use product. Sika Australia Pty Limited ABN aus.sika.com Tel: /5

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